Pulp-screen.



P. P. WESTBYE. PULP SCREEN.

MFPLICATION FILED MAY IT, l8l2- 1,3184 Patented Apr. 6,1915.

5 SHBETS-SHEET 1.

P. P. WESTBYE.

PULP SCREEN.

APPLICATION nuzn MAY 17, 1912.

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Patented Apr. 6, 1915.

5 SHEETS-SHEET Z.

P. P. WESTBYL PULP SCREEN.

APPLICATION FILED MAY 17. 19I2. 1, 1L 3%,8WL O Patented Apr. 6, 1915.

5 SHEETS-SHEET 3. E 4r W WHIHIH" |||||||||H \IH P. P. WESTBYE.

PULP SCREEN.

APPLICATION FILED ram/17.1912.

Patented Apr. 6, 1915 5 SHEETSSHEBT 4.

@582? 3% am I v v m w 1,18%SUQO P. P. WESTBYE.

PULP SCREEN. I APPLICATION FILED MAY. 19I2.

Patented Apr. 6, 1915.

5 SHEETS-SHEBT 5.

aH'o z/neq Ll8304n l Vi ma P. OF EE TERBOROUGH, ONTARIO, CANADA.

ULP-sonnets.

man a Specification of Letters Patent.

Patented A r. a, rats.

Application filed may 17, 1.91.2 Serial No. 698,070.

T all whom it may concern Be it known that I, Pnorm P. WET BY1E, asubject of the King of Norway, residing at Peter-borough, in the countyof Peterborough and Province of Ontario, Canada, have invented certainnew and useful Improvements in Pulp-Screens, of which the following is aspecification My invention relates to paper making machinery andparticularly to pulp screens of the vertical type adapted to separatefine fibrous or usable portions of the pulp from the coarse or unusableportions thereof.

The pulp screen, forming the sub eot matter hereof, is of that typeemploying an annular perforated screen within which is mounted arevoluble distributer operating to discharge the pulp by centrifugaltendency against said annular screen.

The object of the invention is to simplify the structure as well as themeans and mode of operation of such machines, whereby they will not onlybe cheapened in construct on, but will be more eflicient in use,economical in operation, easily operated and unlikely to get out ofrepair.

A further object of the invention is to provide improved pulp feedingmeans whereby the rotary distributer Wlll be supplied with pulp equallythroughout 1ts circle of operation.

It has been found in practice that in screens of this type as usuallyconstructed the pulp is not delivered equally throughout the height ofthe screen but that the greater portion of the pulp is discharged at thetop of the screen, while the lower portions thereof receive but a smallpart of the supply.

A further object of the present invention is to provide an improved formof sectional rotary distributer whereby the entire screen surface may beutilized,thereby increasing the efficiency and capacity of the machine.

It has likewise been found in practice that a considerable amount offine fibrous or usable material adheres to the knots and slivers orother coarse material and is lost by being discharged with the tailings.

A further object of the present invention is to provide means forsubjecting the coarse tailings to a supplemental separating operationwhereby the adhering usable material will be saved. Inasmuch as a highspeed of rotation is desirable in' order that the pulp may be forciblyprojected against the annular screen, a furt er object of the inventionis to provide an auxiliary accelerating means for the revolubledistributer.

Wlth the above primary and other incidental objects in view as will morefully appear in the specification, the invention consists of thefeatures of construction, the parts and combinations thereof and themode of operation, or their equivalents, as heremafter described and setforth in the claims.

Referring to the drawings, Figure 1 is a vertical sectional View of theassembled machine. Fig. 2 is a plan view of the assembled machine partlyin section, such sections being taken at difierent heights on line m mof Fig. 1. Fig. 3 is a detail sectional V ew on line y-y of Fig. 2. Fig.4 is a plan view of the rotary distributer removed from the machine.Fig. 5 is a side elevation thereof. Fig. 6 is a plan view partly insections of the auxiliary distributer for reworking the tailings. Fig. 7is a side elevation thereof. Fig. 8 is a vertical sectional view of saidauxiliary distributer showing the water power accelerator. Fig. 9 is abottom plan view of the auxiliary distributer. Fig. 10 is a sideelevation of the modified form of distributer.

Like parts are indicated by similar characters of reference throughoutthe several views.

In constructing the machine there is provided an annular main casing orhousing Within which is concentrically located a perforated plate orscreen 2 separating the main chamber or housing into a centraldistributer chamber 3 and an annular receiving chamber 4 surroundingsaid screen. In order to give to the main casing or housing thenecessary strength and rigidity pilasters or columns 5 are provided atdifferent points throughout the periphery thereof. Intermediate thepilasters or columns 5 the side walls of the main housing or casingcomprise removable doors or sections 6 by which access may be had to theinterior of the housing. At its lower extremity the annular receivingchamber 4 terminates in a gutter or conduit 7 extending throughout thecircumference of the housing and having a discharge orifice 8 throughwhich the screened material is discharged from the machine. The innercentral or distributer chamber 3 is also provided with an ofl' takeconduit 9 for the discharge of the tailings comprising the knots,slivers and foreign material tto coarse to pass through the perforatedplate or screen. The concentric screen 2 is divided into sections eachof which'is carried upon a segmental supporting frame 11 composed ofangle irons as shown in Figs. 1 and 2. At their lower extremities thescreen supporting frames are grooved or recessed and engage the top edgeof the inner wall of the concentric gutter or conduit 7 as shown at 12of Fig. 1. These segmental screen frames rest upon the said innerconcentric walls of the conduit '7 which walls project within the grooveor recess of the segmental frame. Ad acent to their tops the segmentalscreen sections are supported by bifurcated arms 13 which are pivoted tolugs 14 projecting inward from the wall of the main housing. Thebifurcated extremity of the arm 13 engages on opposite sides,

of the marginal flanges of a jacent screen sections as shown at 15 ofFig. 2. A clamp bolt 16 is provided in the bifurcated portion of thearms 13 by which the arms 13 are made to clamp the screen sections oneto the other. By removing the door or section 6 of the main housingaccess may be had to the screen plate, the sections of which may beremoved for examination or repairs by releasing the clamp screws 16 andturning the tions with the lugs arms 13 upward about their pivotalconnec- 14, out of engagement with the supporting frame of the screen.

A portion of the main housing located above the central or distributerchamber 3 is extended upward as at 17 and provided with internal annularflanges 18 and 19 upon which rest transverse diaphragms 20 and 21dividing such extension 17 of the main housing into two equalizing feedchambers 22 and 23. Projecting from the top surface of the diaphragm isa concentric annular flange 24 extending an equal distance above thediaphragm throughout. Projecting from the under side of the diaphragm 20and coincident with the flange 24 is a concentric pendant sleeve 25projecting within the distributer chamber 3 for the purpose hereinaftermentioned. The diaphragm 21 is provided with a central openingsurrounded by a concentric flange 26 projecting upward from the topsurface of the diaphragm. The central opening of the diaphragm 21 is ofgreater diameter than the sleeve 25. To provide for inspection of theequalizing feed chambers openings are provided in the diaphragm 20 andin the head 27 of the portion 17 of the main housing which openings arenormally closed by covers or valves 28 and 29. For convenience thevalves or covers 28 and 29 have been connected one with the other by astem 30. A pulp supply conduit 31 discharges simultaneously into boththe equalizing feed chambers 22 and 23. The diaphragm 20 is providedwith an upward projecting semiannular sleeve 32 which registers with onehalf of the discharge orifice of the inlet conduit 31 as shownparticularly in Figs. 2 and 3. This semi-annular sleeve 32 serves toconduct a portion of the supply pulp to the lower feeding chamber 23while the remainder of the .pulp supply is discharged directly onto thediaphragm 20 which forms thebottom of the uppermost feeding chamber 22.The pulp discharged thrdugh the semi-annular sleeve 32 collects in thefeeding chamber 23 until itrises to the level of the top of theconcentric flanged opening whereupon it overflows the' flange 26 equallythroughout its entire periphery supplying the upper section of therotary distributer located within the distributing chamber 3 ashereinafter described. At the same time the remainder of the supply ofpulp collects within the feeding chamber 22 until it overflows theupward projecting flange 24 and passes downward through the sleeve 25 tosupply the lower section of said rotary distributer. The rotarydistributer which serves to project the pulp forcibly against aperforated plate or screen in a lateral direction by centrifugaltendency is carried upon ed in bearings 34 and 35 and carrying at itsupper extremity-a drive pulley 36.

In order that the perforated screen plate may be utilized equallythroughout its full height the rotary distributer comprises two sets ofradially disposed wings or vanes, the uppermost set being supplied withpulp from the feeding or equalizing chamber 23 while the lowermost setis supplied from the upper feed chamber 22. Each of the distributersections of the rotor comprises a central conical portion 37 and 38respectively which gradually merges at its lower extremity into ahorizontal shelving portion as at 39 and 40. From these central conicalbodies extend radial distributer wings or vanes 41 preferably slightlyoffset in relation to the axis of the distributer as clearly shown inFig. 4. The wings or vanes ofv the upper and lower sections of thedistributer are further offset in relation with each other or arrangedin alternate relation as shown in Figs. 4 and 5. The wings or vanes arepreferably inclined slightly in an advanced direction whereby the top ofthe vanes extend slightly forward of the bottom thereof. The base of-thecentral conical portions 39 and 40 is extended diagonally outward tomeet the wings or vanes thus forming at the base of the wings aprojecting lip or ledge 42. In order to further equalize thedistribution of the pulp the wings or vanes may be provided withinclined ribs 43 located on the advance side of the vane or wing andinclined to the axis of rotation in a direction substantially parallelwith the central conical body 37 or 38 and a centrally disposed verticalshaft 33 mountmeannealso inclinbd in relation to the wings or vaneswhereby the upper portion at said rib will project a greater distance inadvance at the wing or vane than the bottom These ribs are shownparticularly in Figs 1 and 5. It is to be understood however that theseribs 43 may or may not be used according to the character of thematerial to be operated upon. The ribs 43 are not essential but forcertain character of material they will be found dwirableL While therotor has been herein shdwn described as comprising two distributersections, it is to be understood that for a machine of small capacity asingle'sst of wings may be employed, in which case but one equalizingfeed chamber would be required. Likewise for a large capacity machinethree or more sets of wings might be utilized, each with itscorresponding feed chamber.

As before said, the supply of pulp entering through the inlet conduit 31is divided substantially equally between the feeding chamber 22 and thefeeding chamber23 substantially half of the pulp supply being dischargedinto the latter chamber through the inlet sleeve 32 while the remainderis discharged directly upon the diaphragm 2b. The material overflowingthe concentric flange 26 from the feed chamber 23 supplies the uppersection of therotary distributer equally throughout its circle ofoperation. At the same time the pulp from the feed chamber 22overflowing the concentric flange 24 passes downward through the pendantsleeve 25 which projects within the central conical bodies 37 of therotor and discharges into the lower section of the rotor causing thepulp to be supplied equally throughout the periphery thereof. The rotorwhich travels at a high rate of speed causes the pulp to be dischargedlaterally against the screen plate 2 with great force through thecentrifugal tendency. This causes the finer fibrous portions of the pulpto be carried through the screen plate into the annular chamber 4 wherethey fall into the conduit-7 and are discharged from the machine throughthe outlet 8. The tailings comprising the knots, slivers and foreignmaterial too coarse to pass through the screen plate fall throughgravity and collect upon an inner projecting annular shelf or ledge 44which comprises a portion of the screen supporting frame 11. It has beenfound in practice that considerable usable material adheres to thetailings and so is lost. By subjecting such tailings to a rewashingoperation by forcibly discharging a jet of clear water thereon suchadhering usable portions of pulp may be detached from the coarseunusable portions and by a subsequent rescreening operation such usableportions may be separated therefrom and recovered. In order to save suchadhering the lower portion of the portions of the pulp there is providedin the present construction rewashing and screening means comprising anauxiliary rotary distributer 45 located beneath the main distributerbefore described and carried upon the same shaft. The auxiliarydistributor 45 rotates in unison with the main distributer and comprisesa central annular body from which projects radial wings or values46extending beneath the inward projecting shelf or ledge 44. At itsbottom the annular portion 45 merges into a horizontal shelving portionas at 47 similar to the construction of the main distributor as beforedescribed. This auxiliary distributor is best shown in Figs. 1, 6, 7 and8. Located about the inner periphery of the auxiliary distributor andadjacent-to the top thereof is an annular gutter or channel 48 dividedby radial Walls 49 into segmental sections. Extending radially from thegutter or channel 48 are a plurality of discharge nozzles 50 overhangingthe annular ledge or shelf 44. Projecting upward from the bottom of themain housing is a sleeve 51 having about its periphery a Water passageor conduit 52 provided with discharge orifices 53 adapted to dischargeinto the annular gutter or channel 48 of the auxiliary distributer.

A water supply pipe 54 leads to the annular conduit 52. The constructionis such that water supplied through the inlet pipe 52 is dischargedthrough the orifices 53 throughout the periphery of the conduit 52 intothe adjacent gutter or channel 48 of the auxiliary distributer. Tnasmuchas the auxiliary distributor is being rotated at a high rate of speedthe contrifugal tendency will cause the water collected in the channelor gutter 48 to be forcibly discharged radially through the dischargenozzles 50 upon the shelf or ledge 44 where by mixing with the tailingswhich have collected upon such shelf or ledge it loosens the attachedportions of usable fiber from the coarse or unusable tailings and washesthe mass of tailings and fiber off said ledge or shelf 44, whereupon itis engaged by the wings or vanes 46 of the rapidly revolving auxiliarydistributor and forcibly projected against screen plate. By this meansthe usable pulp which may adhere to the tailings is discharged throughthe screen plate into the annular chamber 4 while the distributorchamber and is finally discharged through the outlet 9.

Inasmuch as considerable power is required to rotate the distributors attheir necessarily high rate of speed it is desirable, although notessential, that auxiliary actuating means he provided for thedistributers.

I To this end there are provided upon the interior of the auxiliarydistributor 45 and beneath the annular channel 48 a series of refusefalls to the bottom of the vanes or buckets 55 upon which aredistributer 45 as a water wheel afi'ording a source of powersupplemental to the drive pulley 36. This auxiliary driving feature isbest shown in Figs. 1, 8 and 9. \Vhile the vanes or wings of the upperand lower distributer sections of the main rotary distributer arepreferably off set or alternately arranged as shown in Fig. 5, thisconstruction is not essential, but the wings of the two sections may bearranged one above the other as shown in Fig. 10. In Fig. 3 the courseof the inflowing supply of.' pulp, whereby the pulp is supplied equallythroughout the entire circle of operation to both the upper and lowersections of the main distributer, is fully shown by the darts or arrows.

i From the above description it will be apparent that there is thusprovided a machine of the character described, possessing the particularfeatures of advantage before enumerated as desirable, but whichobviously is susceptible of modification in its form, proportion, detailconstruction and arrangement of parts without departing from theprinciple involved or sacrificing any of its advantages.

While in order to comply with the statute, the invention has been hereindescribed in language more or less specific as to certain structuralfeatures, it is to be understood that the invention is not limited toany details but that the construction described comprises but one modeof putting the invention into effect and the invention is thereforeclaimed broadly in any of its possible forms or modification within thescope of the appended claims.

Having thus described my invention, I claim;

1. In a pulp screening machine, a screen member, a revolubledistributer, an annular equalizing chamber into which the supply of pulpis received, the bottom of said equalizing chamber having a centrallydisposed flanged opening'thereimthe flange of which is overfiowed by thepulp in its passage to the rotor, substantially as specified.

2. In a pulp screening machine, a screen member, a revolubledistributer, an equalizing chamber into which the supply of pulp isreceived, the said equalizing chamber having a flanged feeding orificelocated coincident with the axis of the revoluble distributer, the saidflange being equal in height throughout whereby the pulp will overflowsaid flange equally throughout its periphery thereby supplying thedistributer equally throughout its circle of operation, Substantially asspecified.

specific herein shown and 4. In a pulp screening machine, a screenmember, a rotary distributer, a plurality of equalizing chambers eachindependent of the other into which the supply of pulp is received, eachchamber being adapted to independently discharge its supply of pulp intothe distributer at a different height, substantially as specified.

5. In a pulp screening machine, a screen member, a rotary distributer, aplurality of equalizing chambers into which the supply of pulp isreceived, concentric flanged openings in the bottoms of said chambers,the flanges about said openings projecting upward above the bottoms ofthe chambers, the said flanged openings being of difierent di ametersand each adapted to discharge pulp from its corresponding chamber intothe distributer, substantially as specified.

6. In a pulp screening machine, a screen member, a rotary distributer, aplurality of equalizing chambers into which the supply of pulp isreceived, a pulp supply conduit leading to the said chambers and adivision wall separating the chambers and registering with the dischargeorifice of the conduit whereby the pulp supply will be apportioned tothe difi'erent chambers, and pulp discharge orifices from each of thechamlpiefis to the distributer, substantially as speci- 7 In a pulpscreening machine, a screen member, a traveling distributer, a pluralityof equalizing chambers located one above the other, a common pulp supplyconduit discharging simultaneously into said chambers, and dischargeconcentric orifices from all of said chambers through which the pulp isdischarged to the distributer, substantially as specified.

8. In a pulp screening machine, a screen member, a rotary distributercomprising a plurality of series of radial vanes the several seriesbeing arranged one above the other, a pulp receiving chamber dividedinto compartments, one for each series of vanes and an independentconduit leading from each compartment to the corresponding series ofvanes, and means for supplying pulp separately to each series,substantially as specified.

9. In a pulp screening machine, a screen member, a rotary distributercomprising a plurality of series of radial vanes the several seriesbeing arranged one above the other, and a plurality of independentconrotary distributor,

centric pul supply conduits, there being one such in ependent conduitfor each series of vanes.

10. In a pulp screening machine, a screen member, a rotary distributer,a pulp supply chamber located above the distributer, and a flangeddischarge orifice for said chamber located concentric with the rotarydistributer, the flange of which projects equidistant above the bottomof the chamber throu hout its entire extent.

I 11. In a pulp screening machine, a screen member, a rotar distributor,an equalizing chamber into w ich the'supply of pulp is received, havinga flanged outlet located in the bottom thereof, said flange terminat ingin a horizontal plane above the bottom of the chamber.

12. In a pulp screening machine, a screen member, a rotary distributer,an equalizing chamber into which the-supply of pulp is received, and anoutlet conduit projecting within the chamber in axial alinement with thedistributor.

13. In a pulp screening machine, a screen member, a rotary distributor,an equalizing chamber into which the supply of pulp is received, and anoutlet conduit discharging into the rotor in a position coincident withthe center of the rotor and walls of the intake extremity of saidconduit terminating within the chamber in a horizontal plane removedfrom the bottom of the chamber 14:. In a pulp screen, a screen member, arotary distributer, an annular channel carried by said distributer,radially disposed discharge nozzles leading from said channel, a watersupply discharging into said' channel, the water collected in saidchannel being discharged in a radial direction by Eenfltrifugaltendency, substantially as speci- 15. In a pulp screen, a screen member,a an annular channel car ried by said distributer, division walls insaid channel dividing into segmental sections, radial discharge nozzlesleading from the channel coincident with the advance side of said walls,and -means for supplying water to said channel to be discharged throughsaid nozzles by centrifugal tendency, substantially as specified.

16. In a pulp screening machine, a screen member, a rotary distributer,a series of buckets carried by the distributor and a menace water supplynozzle adapted to direct a jet of water upon the said buckets toaccelerate the rotation of the distributer, substantially as specified.

the inner side of the main housing wall and v extending inward in aradial direction and engaging the said segmental sections to maintainsaid sections in their adjusted positions substantially as specified.

I8. In a pulp screening machine, a main housing, a rotary distributer,an annular screen member within the housing but spaced away from thewalls thereof to form an intermediate annular chamber, said screenmember being divided into a plurality of segmental sections, armspivotally supported on the inner side of said main housing and extendingradially inward, said arms being bifurcated at their inner extremitiesand adapted to engage the adjacent edges of succeeding sections, tomaintain such sections in adjusted positions, substantially asspecified.

19. In a pulp screening machine, a screen member, a rotary distributor,a pulp charge orifice concentric with the distributer, and a marginalflange surrounding the discharge orifice and projecting in a directionaway from the distributer.

20. In a pulp screening machine, a screen member, a distributor rotatingon a vertical axis, a,pulp supply chamber located above the distributerhaving in its bottom a pulp discharge orifice concentric with the distributer, and a marginal flange surrounding the discharge orifice andprojecting above the bottom of the chamber, and terminating in ahorizontal plane, the construction and arrangement being such that thepulp overflows-the flange from the chamber in passing to thedistributer. v 0.

In testimony whereof, I have hereunto set my hand this 9th day of May A.D. 1912.

PEDER P. SIBYE.

Witnesses:

J. M. BENNET, J. E. L. Goon dis

